$x^2-13x+42-x=0$
$2\cdot2^3\cdot2^{-5}\cdot2^{-1}$
$2x+6=14$
$\frac{x^2+4x-21}{x^3+2x^2+x}$
$15x^2-35$
$f\left(x\right)=\:sen\:x\:cos\:x\:-\:x^2$
$11^4+7x^4-3x^4$
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